Induction-coil and box for explosion-engines.



I PATENTED DEC. a1, 1907. R. VARLEY. I INDUCTION COIL AND BOX FOR EXPLOSION ENGINES.

APPLICATION FILED JULY 24. 1907.

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R. VARLBY. INDUCTION 00m AND BOX FOR EXPLOSION ENGINES.

APPLICATION FILED JULY 24,1907.

3 SHEETSfiSHEET 2.

No. 875,472. PATENTED DEC. 81, 1907.

' R. VARLEY.

INDUCTION COIL AND BOX FOR EXPLOSION ENGINES.

APPLIOATION FILED JULY24, 1907.

3 SHEETS-SHEET 3.

Max: b mjwm KEKALLQ UNITED STATES PATENT OFFICE.

RICHARD VARLEY, OF ENGLEWOOD, NEW JERSEY, ASSIGNORTQ VARLEY DUPLEX MAGNET 00., A GORPORATION OF NEW JERSEY.

INDUCTION-COIL AND BOX FOR EXPLOSION-ENGINES.

Specification of Letters Patent.

Patented Dec. 31, 1907.

Application filed July 24. 1907: Serial No. 385,378.

My invention relates to a form of coil con-- struction or box for use with explosion engines, particularly multiple cylinder engines gflthe type used in motor cars and automo- The purpose of the invention is to improve the construction in various features thereof, and particularly to provide a com act, efficient and easily constructed type 0 ,coil unit and box having the theoretical principles and characteristics set forth in my companion application, Serial No. 382,488, filed July 6, 190

In .my companion application above referred to I have fully set forth and described the action of a pluralit of induction coils when grouped side by si e in firing a multiple 0 linder engine. In said application it is s own that with a crank shaft of certain form, that an uncompressed charge sometimes exists in the cylinder or cylinders immediately adjacent to one which is at that moment being fired, and that furthermore there sometimes exists when the engine is heavily loaded, a condition by which cross induction occurs between adjacent coils so that an acting coil produces a feeble discharge in a neighboring coil, but sufliciently intense in special circumstances to fire the uncompressed charge occurring as mentioned. pointed out arrangements by which this difficulty can be overcome. In the resent application a particular coil box with the coil units, as an article of manufacture is shown, and which fulfils all requirements with regard to preventing cross induction between adjacent coils.

By the present invention the secondary windings are insured against injury by excessive potentials therein which might arise when they are wholly open circuited, and certain other ractical and advanta eous features secured as will be later points out.

With these various objects in View the invention consists in the features of construclength of the completed coil.-

In the said application there are tion and combination hereinafter set forth and claimed.

In the drawings: Figure 1 is a perspective view showing a single coil or unit embodying the principles of-my invention; Fig. 2 is a top or plan view of a coil box showing the coil units assembled therein; Fig. 3 is a erspective view illustrating certain parts of the coil or unit and the manner in which they are assembled; and Fig. 4 is a sectional view on the line IVIV of Fig. 2.

Referring to the drawings in which like parts are designated by the same reference sign, 1 indicates the containin box and 2 the various coils or units adapte 'to be assembled therein. The box has a rabbeted outer edge 3 to receive any suitable cover 4, and

shed water therefrom away from the interior of the box. The various coils or units 2 are of rectangular transverse section and of such a size as to closely fit the containing box 1 when assembled side by side therein, as shown in Fig. 2.. In accordance with the resent invention the various coils or units ave individual casings constructed of magnetic and non-magnetic material, such as iron and wood, in the manner shown in Fig. 3.

.5 indicates a piece of sheet iron, sheet steel I or other paramagnetic material, bent into U-shaped form in transverse section, and having a length corresponding to the desired 6 denotes a wooden-frame of inverted L shaped section, and it is evident that this may be assembled with the sheet iron part 5 so as to form a complete coil casing open at its lower end. The upper lateral extension 7 of the frame 6 constitutes the top of the completed coil casing. This plate is erforated with an opening 8, to receive the iron core of the coil, and with various smaller holes 9, toreceive screws or fastening devices for the various vibrator and terminal 6 indicates a lock or plate forming the bottom of the casing.

The usual condenser is shown at 12.

The induction coil 10 is of the ordinary sort having primary and secondary windings, and in accordance with my present invention, one terminal of each is connected or grounded upon the sheet iron part 5. These connections are indicated by the dotted lines 13 and 14 at the right hand coil in Fig. 2. The other terminals of the respective windings run to 'certain vibrator mechanism and terminal binding posts hereinafter described.

The sheet iron part 5 being made a terminal of the primary and secondary windin s, it becomes necessary to rovide means or establishing a good electric connection with this sheetiron part from the current source employed. For this purpose I provide a metallic plate or strip 15, which is permanently screwed or secured within the coil box 1 along the front upper inside edge thereof. The top edge ,of this strip 15 is notched at a plurality of points 16, corresponding to each of the coil units, and preferably at opposite side edges or corners of the same.

17 indicate bars within the coil casings located at the cornersof the U-shaped sheet iron piece 5. These bars 17 have threaded holes to receive screwsl8, the position and separation of which accords to the location of the notches 16 above described.

19 indicates a bent-over sheet metal plate at the upper edge of the coil --.casing, and which is designed to present a more per fectly finished metallic front face than the sheet iron part 5, which may be japanned or lacquered to give it a better appearance. When the coils are dropped in the box 1, the screws 18 fall in the notches 16 of the strip 15, and when they are tightened, the metallic plate 19'is drawn into close electrical contact with the strip 15. The plate 19 being in soldered or permanent connection with the part 5, it is c ear that the primary and secondary terminals 13 and 14 0 all the coils are in thls Way efficiently connected to the common battery strip 15..

Each coil has a vibrator, including a bridge 20, and a spring blade or trembler 21. The bridge 20 is permanently connected with the un rounded primary terminal 22 (see Fig. 2) and-the blade or trembler 21 is fixed to a metallic base 23, which carries a binding post 24, for the wire leading to the circuit controller. In addition to these parts there is an insulating block 25, permanently attached to'the top late 7 of the coil casin This insulating b ock has a small metal ic plate 26 on its upper face,secured thereto by a single screw 27, and one or more pins 28. The attachment of the block 25 to the coil casing plate 7 is made by screws 29, extending upward fromthe under side thereof, and not in alinement with the screw 27. A further point in this construction is that none of the screws 27 or 29 extends completely through the insulating block 25. These precautions are necessary, because the plate 26 is made the terminal. of the ungrounded secondary windin b a connection 30 (see Fig. 2), which Tea s to a binding post 31, on said plate 26. The distance of the plate 26 from the metallic casing 5'andfrom the bridge 20 therefore determines the maximum possible spark gap through which the secondary winding will dischar c. This maximum spark gapis made abso utely definite by the prongs or extensions 32 and 33 which extend toward one another respectively from the plate 26 and from the sheet-iron casing 5. The insulating block 25 is grooved or cut away adjacent these points in the manner clearly shown at 34, in Fig. 1.

The above construction is an important and advantageous one in practice, since the secondary winding of the coil is liable to become unduly strained by the electrical tension which is developed therein in case the coil should be operated with its secondary circuit open or with an unduly great spark gap. The arrangement of the plate 26 determines the maximum ossible spark ap as the distance betweent e oints 32 an 33, so that it is impossible for t e insulation to become strained, even in case the spark plug connection becomes loose and allows the wire to fall away therefrom and wholly open the secondary circuit at this point.

A feature of the invention lies in the arrangement by which the coil box is kept absolutely water tight. I provide a pluralit of holes 35 and 36, leading upward throug the rear wall or ed e of the coil box 1, at a point within the ra bet 3. At an adequate distance, several inches below the upper edge of the'coil box, these holes join a broad laterally extending groove 37 deeply cut across the rearoutside face of the box. The circuit wires leadin to the spark plugs and the circuit control er pass into the rear of the box through these holes and upward through the edgeof the box where they are joined to the binding posts 24 and 31 respectively. It is evident that whenthe cover is in place, as

shown in Fig. 4, there is no possibility of wa-' ter findin its way into the box through the openings or the circuit wires. When these circuit connections are made in this way, and the coils have been properly tightened in the .box l'by the various screws 18, it is evident that they are ready for operation. If at any time it becomes necessary to replace a 001] for any purpose this is quickly done by loosening the screws 18 and removing the circuit connections of the coil at the binding posts 24 and 31.

having the sheet iron part 5 forming the main part of their containing casing, the coils are magnetically shielded from one another. It is accordingly impossible for cross inducreason of the construction of the coils tion to take place between such adjacent coils and under such circumstances as to produce harmful or improper firing in the manner fully set' forth in my companion case above referred to and which has been briefly touched upon in the preliminary part of this specification. But although cross firing is wholly revented, the presence of the iron part 5 oes not affect injuriously the action of the coil, because the casin is not made metallically continuous comp etely around the coil, being interrupted at the rear side thereof by. the wooden back or frame 6. If desired a small sheet iron plate 5 may be placed at the bottom of the coil'casing and resting on the bottom plate 6 to further inr crease the magnetic shielding effect indicated.

What I claim, is

1. An induction coil unit for explosion engines comprising a U-shaped sheet of paramagnetic material, an L-shaped frame as sembledtherewith to form a casing, andan induction coilwithin such casing.

' 2. An induction coil unit for explosion engines, comprising a paramagnetic. casing of sheet material having an open'side, and an induction coil within the casing.

3. An induction coil unit for explosion engines, comprising a casing including a U- shaped sheet iron part, and a non-magnetic frame assembled therewith to form a casing, and an induction coil within such casing.

4. An induction. coil unit for explosion engines, comprising a casing having a U- shaped sheet of paramagnetic material embodied therein, and an induction coil within. such casing.

5. An induction coil unit for ex 'losion engines, comprising a casing having t ree of its sides formed of a single piece of paramagnetic sheet material, and an induction coil within such casing and having its primary and secondary windings grounded on said paramagnetic sheet material.

6. In an induction coil unit, a casing having one or more of its sides formed of paramagnetic sheet material, an induction coil within such casing and having its primary and secondary windings grounded on said paramagnetic sheet material, -and a plate connected to the other secondary terminal and separated in a predetermined spaced apartrelation from said paramagnetic sheet material, so as to'establish a spark gap in connection therewith.

7. In an induction coil unit, a casing comprising a U-shaped sheet of paramagnetic material and an L-shaped non-magnetic part assembled together to form a casing, an induction coil within such casing and having ed on said part of paramagnetic material,

and an insulating block secured on the casing,

a plate fixed to said block and connected to the ungrounded secondary terminal of said coil, said plate having a portion projecting toward said part of paramagnetic material and establishing a spark gap in connection therewith. j

8. In combination, a pluralit. of induction coil u'nits,*each having a casing of paramagnetic material, the coil box havin a metallic' I strip along one edge thereo and clamping means for engaging and electrically connecting said casing on said strip. I

9. In combination, a plurality of induction coil units, each having a casing of paramagnetic material forming one primary terminal, and a coil box having a metallic strip secured on one inside edge thereof, the upper edge of said strip being notched, and clamping means passed through. said notches and engaging said coil units to electrically and mechanically connect said casings on said strip.

10. In combination, a plurality of induction coil units, each having a casing of para magnetic material, said casing forming a terminal for the I having a metal ic strip, and means engaging .said casings 'for clamping and electrically connecting them to sald strip terial.

11. In combination, a p urality of coil units, each having .a primary and a,second ary terminal binding post, and a coil box having a rabbeted edge said edge being verrimary winding, a coil box tically perforated inside of said rabbet whereby the terminal wires from said coils may be led out of the boxthr'ough said holes in water proof relation.

12. In combination, a plurality of coil units each having 'a casing of paramagnetic material and having primary and secondary terminal wires, a coil box having a rabbeted edge said box having holes extending down- 'ward in said edge inside said rabbet and adapted to receive said terminal wires, a cover for said boxcooperatingwith said rabbet to inclose said coil units, and their teiminal wires in water-proof relation, and means for establishing connection withthe primary and secondary windings of all g the coils through their casings of paramagnetic ma- In Witness whereof, ture, in the presence of two witnesses.

. RICHARD VARLEY. Witnesses: I

,WALno M. Cnarm, REUBEN GREENE.

I subscribe my signa- 

